Khizr Khan, father of fallen U.S. Army Capt. Humayun S. M. Khan holds up a copy of the Constitution of the United States as his wife listens during the final day of the Democratic National Convention in Philadelphia , Thursday, July 28, 2016.

WASHINGTON — The father of a Muslim American soldier killed in Iraq posed a question to Donald Trump: Have you read the Constitution?

To rapturous cheers, Pakistan-born Khizr Khan fiercely attacked the billionaire businessman Thursday at the Democratic convention in Philadelphia, saying that if it were up to Trump, his son never would have been American or served in the military.

Khan said that Hillary Clinton, by contrast, “called my son the best of America.”

The address was the latest effort by Democrats to highlight their diversity and criticize Trump’s most contentious plans. Beyond his proposed wall across Mexico, the billionaire businessman has threatened to ban Muslims from entering the United States if he becomes president.

Capt. Humayun Khan died in 2004 when a car loaded with explosives blew up at his compound. He was 27.

Honoring his son, Khizr Khan pulled a copy of the Constitution out of his suit pocket and offered to lend it to Trump.

“Look for the words ‘liberty’ and ‘equal protection of law,'” he said standing next to his wife, waving the paperback document vigorously.

“Have you ever been to Arlington cemetery?” he then asked. “Go look at the graves of brave Americans who died defending United States of America. You will see all faiths, genders and ethnicities. You have sacrificed nothing.”

Khan, who moved to the U.S. in 1980, said he and his wife were “patriotic American Muslims with undivided loyalty to our country.”

“Like many immigrants, we came to this country emptyhanded,” he said, believing that with hard work he could raise his three sons “in a nation where they were free to be themselves and follow their dreams.”

Trump, Khan argued, was imperiling that ideal with his smears of Muslims, women, judges and other groups.

He urged Muslims, immigrants and all patriots to “to not take this election lightly.”

Democrats Ed Perlmutter and Jared Polis have joined their Republican congressional colleagues in backing legislation that would allow the Bureau of Land Management to relocate it headquarters to the West, and possibly to Colorado.

Two conservative taxpayer advocacy groups filed suit Wednesday against new Denver campaign finance disclosure rules for issue advocacy committees that they say will violate the privacy rights of their donors.